Furnace-grate.



W.M.DUNGAN FURNACE GRATE.

APPLICATION FILED JULY18,1912.

Patented Mar. 3, 1914.

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W. M. DUNCAN.

FURNAGB GBATE. APPLICATION FILED JULY 18, 1912.

Patented M21123, 1914.

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UNITED STATEiiT OFFICE- WILLIAM M. DUN CAN, 0]? ALTON, ILLINOIS.

FFRNACE-GRATE.

Specification of Letters Patent. Application filed Ju1y'18, 1912. Ser al No. 710,140.

the wheels 3 and To all whom it ma z concern: 5 ride over rollers 7 and 8 Patented Mar. 3, 1914. v

Be it known that I, WILLIAM M. DUNCAN, when the drive shaft is rotated. a citizen of theUnited States of America, 9 and 10 designate transverse rods supand resident of Alton, in thecounty of porting the rollers 7 and 8 respectively. Madison and State of Illinois, have in- A designates hollow grate bars arranged v nt d certain new and useful Improve- ,dircctly-between certain side walls of the ments in F urna'ce-Grates, of which the folgrate chains, and supported partly by the lowing is a full, clear, and exact description, transverse rods 9, and partly by a manifold reference being bad to the accompanying 11. The rods 9 pass through sleeves 12 drawings, forming a part of this specificaformed integral with the hollow grate bars m A. The manifold 11 has flanged ends that My invention relates to a furnace grate are secured to the side frames 1, one end of and-has for its object the production of a said manifold being closed by a manhole grate bar through which air under pressure cover 13 secured to one of the side frames, may be conducted to the-bed of fuel sup- (see Fig. ll). Each hollow grate bar A is t d b th t secured to the manifold and, provided with Thepreferred form of myinvention isa mea bottom opening 14, which registers with a chanical stoker comprising endless grate bar corresponding opening in the top of the chains and hollow grate bars'between said manifold-.- Air under pressure may be conchains. Thehollow grate bars are provided ducted to the manifold through a pipe 15, with discharge openings located me higher (Fig. II), and after passing through the plane than the top surfaces of the grate bar nuinifold and into the hollow grate bars, the chains, and air under pressure supplied to air is (-lischarged through openings 16 in the the hollow grate bars is forced through iippcrportions of the hollow grate bars. It said openings and into the bed of .fuel, with will be noted that the hollow grate bars me the result of CtlllSlIl the entire bed of fuel closed to prevent the escape of air throu h to be consumed. T is a decided advantheir side and bottom walls and that the tage over the ordinary grates relying on discharge openings 16 are located in a natural draft or forced draft directed onto higher plane than the top surfaces of the the fuel from a point some distance away grate chains 6, hence the airis discharged from the grate, because the air so supplied into the fuel immediately above the grate cannot penetrate through the entire bed of chains. fuel-it cannot reach the fuel immediately The means for cleaning out the hollow above the grate bars-and as a result an up grate bars compri es scrapers 17 located in preciable percentage of thefuel is never said bars beneath the plane of the top of consumed. the manifold and provided with long hanit will be notcd that air under pressure dies 18 which extend across the manifold to discharged from my improved grate bar the frontof the grate structure where they must pass directly into the fuel bed; it may be very easily reached by the operator. cannot take any other course, and this air Ashes, etc, which accumulate in the hollow penetrating the entire bed of fuel will furgrate bars can be easily drawn into the nish the oxygen necessary for perfect commanifold by means of the scraper 17 and bustion.- afterward removed from the manifold Figure I is a vertical section of a grate through the opening that is normally closed embodying the features of my invention. by the manhole cover 13. Fig. ll is a transverse section of a portion claim of the grate. Fig. III is a perspective view A furnace grate com rising side walls, a of one of'the grate bars. drive shaft having a (ll-ive wheel, an idle -In the accompanying drawings: 1 desigshaft having a driven wheel, 'andtwo series nates side frames supporting a drive shaft of transverse rods; said drive shaft, idle 2, provided with drive wheels 3 and also shaft and series of rods being mounted in an idle shaft 4, provided with plain wheels the said side walls, series of rollers m0unt- .i. Endless grate chains 6 passing around ed on the rods, endless gratechains mounted on said Wheels and series of rollers, a compressed air is discharged into the fuel manifold having a compressed air inlet and and With sleeves through which certain o H aitr oifilets amcll lgcitlted betweegl the1 two sirles said rods pass 0' r0 ers an 0 0w ate ars ocate be- I H tween the endless gra'tg ehains and connect- WILLIAM DUNCAN ed with the air outlets of the manifold, In the presence of each of the grate bars being formed with A. R. CROSSMAN, openings in the top thereof through which A. H. BLAIR. 

